This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 8 |
| 3 | 49 |
| 4 | 272 |
| 5 | 1441 |
| 6 | 7448 |
| 7 | 37969 |
| 8 | 192032 |
| 9 | 966721 |
| 10 | 4853288 |
| 11 | 24325489 |
| 12 | 121804592 |
| 13 | 609554401 |
| 14 | 3049366328 |
| 15 | 15251614609 |
| 16 | 76272421952 |
| 17 | 381405156481 |
| 18 | 1907154922568 |
| 19 | 9536162033329 |
| 20 | 47681972428112 |
| 21 | 238413348924961 |
| 22 | 1192077204978008 |
| 23 | 5960417405949649 |
| 24 | 29802181172927072 |